The Xbox One's game installation sizes

The Xbox will come with 500GB of storage. Sounds like a good amount but with the next-gen consoles you will have to install your games. Some of the titles are pretty massive like NBA 2K14, which is a 43GB install. You might have to worry about filling up your console too quickly if you're an avid gamer. Although some titles are not as big like Xbox Fitness is only 246MB install.

Some of the people from NeoGAF have been testing install sizes including @midnightswami. Here is a list from NeoGAF.

-Assassin's Creed IV: Black Flag - 20GB

-Battlefield 4 - 33GB

-Call of Duty: Ghosts - 39GB

-Crimson Dragon

-Dead Rising 3 - 19GB

-FIFA 14 - 8GB

-Fighter Within - 9.2GB

-Forza Motorsport 5 - 31GB

-Just Dance 2014 - 22GB

-Killer Instinct - 2.4GB (3.4GB for full install, can play after 2.4GB)